According to the kinetic theory of gases, a gas exerts a pressure on the inner walls of its container.
Which of the following physical processes is the direct cause of this pressure?
The change in the kinetic energy of the gas molecules during collisions.
The change in the momentum of the gas molecules as they rebound from the walls.
The attractive gravitational force between the gas molecules and the walls.
The thermal expansion of individual gas molecules upon contact with the walls.
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.